
/* Copyright 1998 by the Massachusetts Institute of Technology.
 * Copyright (C) 2004-2011 by Daniel Stenberg
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in
 * advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 */

#include "ares_setup.h"

#include <assert.h>

#include "ares.h"
#include "ares_private.h"

void ares_destroy_options(struct ares_options* options)
{
    int i;

    if (options->servers)
        ares_free(options->servers);
    for (i = 0; i < options->ndomains; i++)
        ares_free(options->domains[i]);
    if (options->domains)
        ares_free(options->domains);
    if (options->sortlist)
        ares_free(options->sortlist);
    if (options->lookups)
        ares_free(options->lookups);
}

void ares_destroy(ares_channel channel)
{
    int i;
    struct query* query;
    struct list_node* list_head;
    struct list_node* list_node;

    if (!channel)
        return;

    list_head = &(channel->all_queries);
    for (list_node = list_head->next; list_node != list_head;) {
        query = list_node->data;
        list_node = list_node->next; /* since we're deleting the query */
        query->callback(query->arg, ARES_EDESTRUCTION, 0, NULL, 0);
        ares__free_query(query);
    }
#ifndef NDEBUG
    /* Freeing the query should remove it from all the lists in which it sits,
   * so all query lists should be empty now.
   */
    assert(ares__is_list_empty(&(channel->all_queries)));
    for (i = 0; i < ARES_QID_TABLE_SIZE; i++) {
        assert(ares__is_list_empty(&(channel->queries_by_qid[i])));
    }
    for (i = 0; i < ARES_TIMEOUT_TABLE_SIZE; i++) {
        assert(ares__is_list_empty(&(channel->queries_by_timeout[i])));
    }
#endif

    ares__destroy_servers_state(channel);

    if (channel->domains) {
        for (i = 0; i < channel->ndomains; i++)
            ares_free(channel->domains[i]);
        ares_free(channel->domains);
    }

    if (channel->sortlist)
        ares_free(channel->sortlist);

    if (channel->lookups)
        ares_free(channel->lookups);

    ares_free(channel);
}

void ares__destroy_servers_state(ares_channel channel)
{
    struct server_state* server;
    int i;

    if (channel->servers) {
        for (i = 0; i < channel->nservers; i++) {
            server = &channel->servers[i];
            ares__close_sockets(channel, server);
            assert(ares__is_list_empty(&server->queries_to_server));
        }
        ares_free(channel->servers);
        channel->servers = NULL;
    }
    channel->nservers = -1;
}
